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This huge commit adds the following features:

- Change default timeout to 5 sec (to be updated soon)
- Don't send TTP information in contract file, but during start signal
- Platform: load and save TTP data from a local file
  New flags: --addr and --ttps
- Platform ttp command: automatically save ttp data in the local file
  (addr and certificate hash are the only values needed by the platform
  and the clients)
- Update integration tests to integrate TTP

- pAPI allow to send multiple IPs
- Rebuild of protobuf files with updated protoc
- Send client interface ips
- Remove user ip & port from mongo
- Fix uint port issue

- Add hash check to client connect()
- Update net.Connect calls
- Implement remote cert hash check

- Add sub-commands flags
- Factorize version commands
- Fix import format
- Fix GUI

- Factorizes code between promises and signatures
- Add a cooldown before starting the first round
- Add demonstrator trace in integration tests

+ Fix alignement issue in dfssd/api
+ Add `TODO` for GetAllButOne complexity
+ Re-order vendor in sequence_analysis_test.go
+ Fix shadowing by refining var
+ and plenty of other fixes...

- Fix missing sequence initialization
- Fix missing answer in grpc handlers
- Fix hashToID key issue
- Do all rounds of promises

Fix #3 - Should be merged asap in 192 branch

See !41

- Use uint32 instead of int for sequence generation
- Send sequence in READY message
- Check that DFSS file has not been compromised
- Remove sequence from DFSS file
- Use more explicit output for client during signature

- common package now contains a waitingGroup, a useful struct to deal
  with synchronization
- updated version of gRPC api should be more efficient for signature
  initialization (untested)

- Add a method in `dfss/auth` package to compute a certificate's hash
- Update `dfssp/contract.Builder` to allow `dfssp/user` package to
  trigger some mail emissions
- Update `dfssp/user` to fix authentication (bad expiration and bad
  certHash)
- Fix a critical bug in client during creation of new contract (nil
  pointer)

TG-293 #ready

- Update platform mockup
- Fix hash bug in platform
- Fix CLI interactions